81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
/* -*- c++ -*- ----------------------------------------------------------
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LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
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http://lammps.sandia.gov, Sandia National Laboratories
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Steve Plimpton, sjplimp@sandia.gov
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Copyright (2003) Sandia Corporation. Under the terms of Contract
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DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
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certain rights in this software. This software is distributed under
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the GNU General Public License.
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See the README file in the top-level LAMMPS directory.
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------------------------------------------------------------------------- */
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#ifdef PAIR_CLASS
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PairStyle(lj/cubic,PairLJCubic)
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#else
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#ifndef LMP_PAIR_LJ_CUBIC_H
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#define LMP_PAIR_LJ_CUBIC_H
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#include "pair.h"
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namespace LAMMPS_NS {
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class PairLJCubic : public Pair {
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public:
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PairLJCubic(class LAMMPS *);
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virtual ~PairLJCubic();
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virtual void compute(int, int);
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void settings(int, char **);
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void coeff(int, char **);
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double init_one(int, int);
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void write_restart(FILE *);
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void read_restart(FILE *);
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void write_restart_settings(FILE *);
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void read_restart_settings(FILE *);
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double single(int, int, int, int, double, double, double, double &);
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protected:
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double **cut,**cut_inner,**cut_inner_sq;
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double **epsilon,**sigma;
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double **lj1,**lj2,**lj3,**lj4;
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void allocate();
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};
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namespace PairLJCubicConstants {
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// LJ quantities scaled by epsilon and rmin = sigma*2^1/6
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static const double RT6TWO = 1.1224621; // 2^1/6
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static const double SS = 1.1086834; // inflection point (13/7)^1/6
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static const double PHIS = -0.7869823; // energy at s
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static const double DPHIDS = 2.6899009; // gradient at s
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static const double A3 = 27.93357; // cubic coefficient
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static const double SM = 1.5475375; // cubic cutoff = s*67/48
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}
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}
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#endif
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#endif
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/* ERROR/WARNING messages:
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E: Illegal ... command
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Self-explanatory. Check the input script syntax and compare to the
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documentation for the command. You can use -echo screen as a
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command-line option when running LAMMPS to see the offending line.
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E: Incorrect args for pair coefficients
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Self-explanatory. Check the input script or data file.
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*/
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